public Statement CompileStatement(AstStatement e)
{
switch (e.StatementType)
{
default:
if (e is AstExpression)
{
return(CompileExpression(e as AstExpression));
}
break;
case AstStatementType.VariableDeclaration:
return(CompileVariableDeclaration(e as AstVariableDeclaration));
case AstStatementType.FixedArrayDeclaration:
return(CompileFixedArrayDeclaration(e as AstFixedArrayDeclaration));
case AstStatementType.Scope:
return(CompileScope(e as AstScope));
case AstStatementType.Draw:
return(Compiler.BlockBuilder.CompileDraw(Function, VariableScopeStack, e as AstDraw));
case AstStatementType.DrawDispose:
return(new DrawDispose(e.Source));
case AstStatementType.Break:
return(new Break(e.Source));
case AstStatementType.Continue:
return(new Continue(e.Source));
case AstStatementType.Unchecked:
{
CheckCastStack.Add(false);
try
{
return(CompileStatement(((AstModifiedStatement)e).Statement));
}
finally
{
CheckCastStack.RemoveLast();
}
}
case AstStatementType.IfElse:
{
var s = e as AstIfElse;
if (s.Condition is AstDefined)
{
var def = s.Condition as AstDefined;
return(Environment.Test(def.Source, def.Condition)
? s.OptionalIfBody != null
? CompileStatement(s.OptionalIfBody)
: new NoOp(s.Source)
: s.OptionalElseBody != null
? CompileStatement(s.OptionalElseBody)
: new NoOp(s.Source));
}
var r = new IfElse(s.Source, CompileCondition(s.Condition));
if (s.OptionalIfBody != null)
{
r.OptionalIfBody = CompileStatement(s.OptionalIfBody);
}
if (s.OptionalElseBody != null)
{
r.OptionalElseBody = CompileStatement(s.OptionalElseBody);
}
return(r);
}
case AstStatementType.ExternScope:
{
var s = (AstExternScope)e;
return(new ExternScope(s.Source,
Compiler.CompileAttributes(Namescope, s.Attributes),
s.Body.String,
ExtensionTransform.CreateObject(s.Source, Function, TypeBuilder.Parameterize(Function.DeclaringType)),
s.OptionalArguments != null
? CompileArgumentList(s.OptionalArguments)
: ExtensionTransform.CreateArgumentList(s.Source, Function),
GetUsings(s.Source)));
}
case AstStatementType.While:
{
var s = e as AstLoop;
var r = new While(s.Source, false, CompileCondition(s.Condition));
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
if (s.OptionalBody != null)
{
r.OptionalBody = CompileStatement(s.OptionalBody);
}
if (s.OptionalBody == null || (!s.OptionalBody.IsInvalid && ((s.OptionalBody is AstScope && (s.OptionalBody as AstScope).IsClosed) || !(s.OptionalBody is AstScope))))
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
return(r);
}
case AstStatementType.DoWhile:
{
var s = e as AstLoop;
var r = new While(s.Source, true, CompileCondition(s.Condition));
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
if (s.OptionalBody != null)
{
r.OptionalBody = CompileStatement(s.OptionalBody);
}
if (s.OptionalBody == null || (!s.OptionalBody.IsInvalid && ((s.OptionalBody is AstScope && (s.OptionalBody as AstScope).IsClosed) || !(s.OptionalBody is AstScope))))
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
return(r);
}
case AstStatementType.For:
{
var s = e as AstFor;
var r = new For(s.Source);
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
if (s.OptionalInitializer != null)
{
r.OptionalInitializer = CompileStatement(s.OptionalInitializer);
}
if (s.OptionalCondition != null)
{
r.OptionalCondition = CompileCondition(s.OptionalCondition);
}
if (s.OptionalBody != null)
{
r.OptionalBody = CompileStatement(s.OptionalBody);
}
if (s.OptionalIncrement != null)
{
r.OptionalIncrement = CompileExpression(s.OptionalIncrement);
}
if (s.OptionalBody == null ||
(!s.OptionalBody.IsInvalid && ((s.OptionalBody is AstScope && (s.OptionalBody as AstScope).IsClosed) ||
!(s.OptionalBody is AstScope))))
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
return(r);
}
case AstStatementType.Foreach:
{
var s = e as AstForeach;
var scope = new Scope(s.Source);
var collection = CompileExpression(s.Collection);
Statement result;
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
VerifyVariableName(s.ElementName.Source, s.ElementName.Symbol);
if (collection.ReturnType.IsArray ||
collection.ReturnType == Essentials.String)
{
var loop = new For(s.Source)
{
OptionalBody = scope
};
var collectionVar = new Variable(s.Collection.Source, Function, Namescope.GetUniqueIdentifier("array"), collection.ReturnType);
if (collection is LoadLocal)
{
collectionVar = (collection as LoadLocal).Variable;
}
else
{
vscope.Variables.Add(collectionVar.Name, collectionVar);
}
var indexInitializer = new Constant(s.Collection.Source, Essentials.Int, 0);
var lengthInitializer = CompileImplicitCast(s.Collection.Source, Essentials.Int,
CompileExpression(
new AstMember(
new AstIdentifier(s.Collection.Source, collectionVar.Name),
new AstIdentifier(s.Collection.Source, "Length"))));
var indexVar = new Variable(s.Collection.Source, Function, Namescope.GetUniqueIdentifier("index"), Essentials.Int);
var lengthVar = new Variable(s.Collection.Source, Function, Namescope.GetUniqueIdentifier("length"), Essentials.Int);
if (collection is LoadLocal)
{
indexVar.OptionalValue = indexInitializer;
lengthVar.OptionalValue = lengthInitializer;
loop.OptionalInitializer = new VariableDeclaration(indexVar, lengthVar);
}
else
{
loop.OptionalInitializer = new SequenceOp(
new StoreLocal(s.Collection.Source, collectionVar, collection),
new StoreLocal(s.Collection.Source, indexVar, indexInitializer),
new StoreLocal(s.Collection.Source, lengthVar, lengthInitializer));
}
vscope.Variables.Add(indexVar.Name, indexVar);
vscope.Variables.Add(lengthVar.Name, lengthVar);
loop.OptionalCondition = CompileCondition(
new AstBinary(AstBinaryType.LessThan,
new AstIdentifier(s.Collection.Source, indexVar.Name),
s.Collection.Source,
new AstIdentifier(s.Collection.Source, lengthVar.Name)));
loop.OptionalIncrement = new FixOp(s.Collection.Source, FixOpType.IncreaseBefore,
new LoadLocal(s.Collection.Source, indexVar));
var elementType = s.ElementType.ExpressionType == AstExpressionType.Var
? collection.ReturnType.IsArray
? collection.ReturnType.ElementType
: Essentials.Char
: NameResolver.GetType(Namescope, s.ElementType);
var elementVar = new Variable(s.ElementName.Source, Function, s.ElementName.Symbol, elementType, VariableType.Iterator,
CompileImplicitCast(s.ElementName.Source, elementType,
CompileExpression(
new AstCall(AstCallType.LookUp,
new AstIdentifier(s.ElementName.Source, collectionVar.Name),
new AstIdentifier(s.ElementName.Source, indexVar.Name)))));
scope.Statements.Add(new VariableDeclaration(elementVar));
vscope.Variables.Add(elementVar.Name, elementVar);
result = loop;
}
else
{
// TODO: Verify that collection implements IEnumerable<T>
var loop = new While(s.Source)
{
OptionalBody = scope
};
var enumeratorInitializer = ILFactory.CallMethod(s.Collection.Source, collection.Address, "GetEnumerator");
var enumeratorVar = new Variable(s.Collection.Source, Function, Namescope.GetUniqueIdentifier("enum"), enumeratorInitializer.ReturnType, VariableType.Default, enumeratorInitializer);
vscope.Variables.Add(enumeratorVar.Name, enumeratorVar);
loop.Condition = CompileImplicitCast(s.Collection.Source, Essentials.Bool,
ILFactory.CallMethod(s.Collection.Source,
new LoadLocal(s.Collection.Source, enumeratorVar).Address,
"MoveNext"));
var elementInitializer = CompileExpression(new AstMember(
new AstIdentifier(s.ElementName.Source, enumeratorVar.Name),
new AstIdentifier(s.ElementName.Source, "Current")));
var elementType = s.ElementType.ExpressionType == AstExpressionType.Var
? elementInitializer.ReturnType
: NameResolver.GetType(Namescope, s.ElementType);
var elementVar = new Variable(s.Source, Function, s.ElementName.Symbol, elementType, VariableType.Iterator,
CompileImplicitCast(s.ElementName.Source, elementType, elementInitializer));
var hasDispose = false;
foreach (var m in enumeratorVar.ValueType.Methods)
{
if (m.Name == "Dispose" && m.Parameters.Length == 0)
{
hasDispose = true;
break;
}
}
// Optimization: avoid casting to IDisposable when Dispose() method is found
var dispose = hasDispose
? ILFactory.CallMethod(s.Collection.Source,
new LoadLocal(s.Collection.Source, enumeratorVar).Address,
"Dispose")
: ILFactory.CallMethod(s.Collection.Source,
new CastOp(s.Collection.Source, Essentials.IDisposable,
new LoadLocal(s.Collection.Source, enumeratorVar)).Address,
"Dispose");
scope.Statements.Add(new VariableDeclaration(elementVar));
vscope.Variables.Add(elementVar.Name, elementVar);
result = new Scope(s.Source,
new VariableDeclaration(enumeratorVar),
new TryCatchFinally(s.Source,
new Scope(s.Source, loop),
new Scope(s.Source, dispose)));
}
if (s.OptionalBody != null)
{
var body = CompileStatement(s.OptionalBody);
if (body is Scope)
{
scope.Statements.AddRange((body as Scope).Statements);
}
else
{
scope.Statements.Add(body);
}
}
if (s.OptionalBody == null ||
!s.OptionalBody.IsInvalid && ((s.OptionalBody is AstScope && (s.OptionalBody as AstScope).IsClosed) ||
!(s.OptionalBody is AstScope)))
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
return(result);
}
case AstStatementType.Return:
return(new Return(e.Source));
case AstStatementType.ReturnValue:
{
var s = e as AstValueStatement;
var returnValue = CompileExpression(s.Value);
var returnType = Lambdas.Count == 0
? Function.ReturnType
: Lambdas.Peek().DelegateType.ReturnType;
return(new Return(s.Source, CompileImplicitCast(s.Source, returnType, returnValue)));
}
case AstStatementType.TryCatchFinally:
{
var s = e as AstTryCatchFinally;
var tryScope = CompileScope(s.TryScope);
var catchBlocks = new List <CatchBlock>();
Scope finallyScope = null;
foreach (var c in s.CatchBlocks)
{
var exceptionType =
c.OptionalType != null?
NameResolver.GetType(Namescope, c.OptionalType) :
Essentials.Exception;
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
VerifyVariableName(c.Name.Source, c.Name.Symbol);
var exceptionVar = new Variable(c.Name.Source, Function, c.Name.Symbol, exceptionType, VariableType.Exception);
vscope.Variables.Add(exceptionVar.Name, exceptionVar);
var catchBody = CompileScope(c.Body);
if (c.Body == null || !c.Body.IsInvalid && c.Body.IsClosed)
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
catchBlocks.Add(new CatchBlock(c.Name.Source, exceptionVar, catchBody));
}
if (s.OptionalFinallyScope != null)
{
finallyScope = CompileScope(s.OptionalFinallyScope);
}
return(new TryCatchFinally(s.Source, tryScope, finallyScope, catchBlocks.ToArray()));
}
case AstStatementType.Lock:
{
var s = e as AstLock;
var scope = new Scope(s.Source);
var tryScope = new Scope(s.Source);
var finallyScope = new Scope(s.Source);
var obj = CompileExpression(s.Object);
switch (obj.ExpressionType)
{
case ExpressionType.LoadLocal:
case ExpressionType.LoadArgument:
case ExpressionType.LoadField:
case ExpressionType.This:
case ExpressionType.Base:
if (!obj.ReturnType.IsReferenceType)
{
Log.Error(obj.Source, ErrorCode.E0000, "Only reference types can be used in 'lock'");
}
break;
default:
Log.Error(obj.Source, ErrorCode.E0000, "Only variables can occur inside 'lock' initializer");
break;
}
if (s.OptionalBody != null)
{
tryScope.Statements.Add(CompileStatement(s.OptionalBody));
}
scope.Statements.Add(ILFactory.CallMethod(obj.Source, Essentials.Monitor, "Enter", obj));
finallyScope.Statements.Add(ILFactory.CallMethod(obj.Source, Essentials.Monitor, "Exit", obj));
scope.Statements.Add(new TryCatchFinally(s.Source, tryScope, finallyScope));
return(scope);
}
case AstStatementType.Using:
{
var s = e as AstUsing;
var scope = new Scope(s.Source);
var objects = new List <Expression>();
var vscope = new VariableScope();
VariableScopeStack.Add(vscope);
var init = CompileStatement(s.Initializer);
for (int i = 0; i < 1; i++)
{
switch (init.StatementType)
{
case StatementType.VariableDeclaration:
{
scope.Statements.Add(init);
for (var var = ((VariableDeclaration)init).Variable;
var != null;
var = var.Next)
{
objects.Add(new LoadLocal(var.Source, var));
}
continue;
}
case StatementType.Expression:
{
if (AddObjects(objects, (Expression)init))
{
continue;
}
break;
}
}
// TODO: Actually some expressions are valid as well in C#. Read spec and implement later
Log.Error(init.Source, ErrorCode.E0000, "Only variable declarations, fields and/or local variables can occur inside 'using' initializer");
}
var tryScope = new Scope(s.Source);
var finallyScope = new Scope(s.Source);
if (s.OptionalBody != null)
{
tryScope.Statements.Add(CompileStatement(s.OptionalBody));
}
foreach (var dispose in Enumerable.Reverse(objects))
{
var idisposable = CompileImplicitCast(dispose.Source, Essentials.IDisposable, dispose);
finallyScope.Statements.Add(ILFactory.CallMethod(dispose.Source, idisposable, "Dispose"));
}
scope.Statements.Add(new TryCatchFinally(s.Source, tryScope, finallyScope));
if (s.OptionalBody == null ||
(!s.OptionalBody.IsInvalid && ((s.OptionalBody is AstScope && (s.OptionalBody as AstScope).IsClosed) ||
!(s.OptionalBody is AstScope))))
{
VariableScopeStack.Remove(vscope);
CurrentVariableScope.Scopes.Add(vscope);
}
return(scope);
}
case AstStatementType.ThrowValue:
{
var s = e as AstValueStatement;
return(new Throw(s.Source, CompileExpression(s.Value)));
}
case AstStatementType.Throw:
{
for (int i = VariableScopeStack.Count - 1; i >= 0; i--)
{
foreach (var v in VariableScopeStack[i].Variables.Values)
{
if (v.IsException)
{
return(new Throw(e.Source, new LoadLocal(e.Source, v), true));
}
}
}
return(Error(e.Source, ErrorCode.E0000, "Cannot rethrow outside of catch block"));
}
case AstStatementType.Switch:
{
var s = e as AstSwitch;
var c = CompileExpression(s.Condition);
if (!c.ReturnType.IsIntegralType)
{
c = TryCompileImplicitCast(s.Source, Essentials.Int, c) ??
Error(s.Condition.Source, ErrorCode.E3415, "A switch expression must be of enum or integral type");
}
var cases = new List <SwitchCase>();
foreach (var a in s.Cases)
{
var handler = CompileScope(a.Scope);
var values = new List <Constant>();
var includesDefault = false;
foreach (var v in a.Values)
{
if (v == null)
{
includesDefault = true;
continue;
}
var sym = CompileImplicitCast(v.Source, c.ReturnType, CompileExpression(v));
var constSym = Compiler.ConstantFolder.TryMakeConstant(sym);
if (constSym != null)
{
values.Add(constSym);
}
else if (sym.IsInvalid)
{
values.Add(new Constant(sym.Source, DataType.Invalid, -1));
}
else
{
Log.Error(v.Source, ErrorCode.E3410, "Case-expression must be constant");
}
}
cases.Add(new SwitchCase(values.ToArray(), includesDefault, handler));
}
return(new Switch(s.Source, c, cases.ToArray()));
}
case AstStatementType.Assert:
{
if (!Environment.Debug)
{
return(new NoOp(e.Source, "Stripped assert"));
}
var s = e as AstValueStatement;
var value = CompileExpression(s.Value);
var args = new List <Expression>
{
value,
new Constant(s.Source, Essentials.String, value.ToString()),
new Constant(s.Source, Essentials.String, s.Source.File.ToString().Replace('\\', '/')),
new Constant(s.Source, Essentials.Int, s.Source.Line),
};
var locals = new List <StoreLocal>();
switch (value.ExpressionType)
{
case ExpressionType.CallUnOp:
{
var o = value as CallUnOp;
args.Add(CreateAssertIndirection(ref o.Operand, locals, Namescope));
break;
}
case ExpressionType.CallBinOp:
{
var o = value as CallBinOp;
args.Add(CreateAssertIndirection(ref o.Left, locals, Namescope));
args.Add(CreateAssertIndirection(ref o.Right, locals, Namescope));
break;
}
case ExpressionType.BranchOp:
{
var o = value as BranchOp;
args.Add(CreateAssertIndirection(ref o.Left, locals, Namescope));
args.Add(CreateAssertIndirection(ref o.Right, locals, Namescope));
break;
}
case ExpressionType.CallMethod:
{
var o = value as CallMethod;
for (int i = 0; i < o.Arguments.Length; i++)
{
args.Add(CreateAssertIndirection(ref o.Arguments[i], locals, Namescope));
}
break;
}
}
var result = ILFactory.CallMethod(s.Source, "Uno.Diagnostics.Debug", "Assert", args.ToArray());
while (locals.Count > 0)
{
result = new SequenceOp(locals.RemoveLast(), result);
}
return(result);
}
case AstStatementType.DebugLog:
{
if (!Environment.Debug)
{
return(new NoOp(e.Source, "Stripped debug_log"));
}
var s = (AstValueStatement)e;
var message = CompileExpression(s.Value);
return(ILFactory.CallMethod(s.Source, "Uno.Diagnostics.Log", "Debug", message));
}
case AstStatementType.BuildError:
return(CreateBuildError(e.Source, true));
case AstStatementType.BuildWarning:
return(CreateBuildError(e.Source, false));
case AstStatementType.BuildErrorMessage:
{
var s = (AstValueStatement)e;
return(CreateBuildError(e.Source, true, s.Value));
}
case AstStatementType.BuildWarningMessage:
{
var s = (AstValueStatement)e;
return(CreateBuildError(e.Source, false, s.Value));
}
}
Log.Error(e.Source, ErrorCode.I3411, "Unknown statement type <" + e.StatementType + ">");
return(Expression.Invalid);
}